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    <title>Document</title>
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<body>
    <script>
        let arr = [3,6,9,1,4,5,7]
        for(let i = 0 ; i < arr.length-1; i++){
            //冒泡排序 还是不熟啊。。。。。
            for(let j = 0 ; j < arr.length -1 -i ; j++){
                if(arr[j]>arr[j+1]){
                    [arr[j+1],arr[j]] = [arr[j],arr[j+1]]
                }
            }
        }
        console.log(arr)
    </script>
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